An IP origination point and method to determine transcoding in packet communications are provided. The IP origination point in one example embodiment includes a communication interface configured to exchange packet communications with a media transport path, a storage system configured to store an origination communication, payload data for the origination communication, integrity information for the origination communication that is configured to be modified by one or more transcoding operations, and returned integrity information that may have been modified by the one or more transcoding operations. A processing system generates and transmits the origination communication into the media transport path, compares the returned integrity information to the integrity information, and determines a transcoding level of transcoding that occurred in the media transport path if the returned integrity information is not equal to the sent integrity information.
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1. An IP origination point to determine transcoding in packet communications, comprising: a communication interface configured to exchange packet communications with a media transport path; a storage system configured to store an origination communication, payload data for the origination communication, integrity information for the origination communication that is configured to be modified by one or more transcoding operations, and returned integrity information that may have been modified by one or more transcoding operations; and a processing system coupled to the communication interface and the storage system, with the processing system configured to generate and transmit the origination communication into the media transport path, compare the returned integrity information to the integrity information, and determine a transcoding level of transcoding that occurred in the media transport path if the returned integrity information is not equal to the integrity information.
An IP endpoint checks if media packets are modified ("transcoded") during transmission. It sends media packets with an integrity check value. After the packets traverse a network, the endpoint re-checks the integrity value. If different, the endpoint infers that transcoding occurred and determines the "level" of transcoding applied. The endpoint has a network interface for sending/receiving, storage for original packets, integrity values (both sent and received), and a processor to generate/compare integrity values and detect transcoding levels.
2. The IP origination point of claim 1 , wherein multiple transcoding operations may be detected using the returned integrity information.
The IP endpoint to detect transcoding from the previous description can detect *multiple* different transcoding operations that occurred during packet transmission by analyzing the modifications to the returned integrity information.
3. The IP origination point of claim 1 , with the processing system configured to store the transcoding level in the storage system, with the transcoding level comprising a detected narrowest transcoding.
The IP endpoint to detect transcoding from the initial description stores the detected transcoding level (representing the most restrictive transcoding detected) in its storage system for later use.
4. The IP origination point of claim 1 , with the processing system being further configured to store the transcoding level in the storage system, generate a transcode-ready data comprising the payload data modified according to the transcoding level, and generate a re-origination communication including the transcode-ready data, wherein the re-origination communication re-originates the communication session using the transcode-ready data.
The IP endpoint to detect transcoding from the initial description stores the detected transcoding level, then uses that level to modify the original payload data to be compatible with the determined transcoding. It generates a new ("re-origination") packet with the modified data and restarts the communication session using this new, transcoding-compatible data.
5. The IP origination point of claim 1 , with the IP origination point storing transcoding data of the communication session.
The IP endpoint to detect transcoding from the initial description stores data related to transcoding that occurred during a communication session, allowing it to track and analyze transcoding patterns.
6. The IP origination point of claim 1 , with the integrity information comprising predetermined information that is added or appended to the payload data of the origination communication.
The IP endpoint to detect transcoding from the initial description uses integrity information that is created by adding or appending predetermined data to the payload data of the media packets before sending them.
7. The IP origination point of claim 1 , with the integrity information comprising predetermined information that is modified into or subtracted from the payload data of the origination communication.
The IP endpoint to detect transcoding from the initial description uses integrity information that is created by modifying or subtracting predetermined data *from* the payload data of the media packets before sending them.
8. A method of operating a packet communication network to determine transcoding in packet communications, the method comprising: generating an origination communication in an IP origination point and transmitting the origination communication into a media transport path, with the origination communication including payload data and integrity information that is configured to be modified by one or more transcoding operations; the IP origination point comparing a returned integrity information to the integrity information, wherein the returned integrity information may have been modified by the one or more transcoding operations; the IP origination point determining a transcoding level of transcoding that occurred in the media transport path if the returned integrity information is not equal to the sent integrity information and generating a re-origination communication based on the determined transcoding level; and the IP origination point transmitting the re-origination communication into the media transport path.
A method for detecting media packet modifications ("transcoding") in a network. An IP endpoint sends media packets with payload data and an integrity check value. After network transmission, the endpoint compares the returned integrity value with the original. If different, transcoding is detected, and the "level" of transcoding is determined. A new packet is generated based on the determined transcoding level and then re-transmitted into the network.
9. The method of claim 8 , wherein multiple transcoding operations may be detected using the returned integrity information.
The method to detect transcoding from the previous description involves detecting *multiple* different transcoding operations that occurred during packet transmission by analyzing the modifications to the returned integrity information.
10. The method of claim 8 , further comprising storing the transcoding level, with the transcoding level comprising a narrowest transcoding.
The method to detect transcoding from the initial description involves storing the determined transcoding level, representing the most restrictive transcoding that occurred.
11. The method of claim 8 , further comprising: storing the transcoding level, with the transcoding level comprising a narrowest transcoding; generating a transcode-ready data comprising the payload data modified according to the transcoding level; and generating the re-origination communication including the transcode-ready data, wherein the re-origination communication re-originates the communication session using the transcode-ready data.
The method to detect transcoding from the initial description involves storing the determined transcoding level, representing the most restrictive transcoding that occurred. Then, the original payload data is modified to be compatible with this transcoding level. A new packet ("re-origination communication") containing the modified data is generated, and the communication session is restarted using this packet.
12. The method of claim 8 , further comprising storing transcoding data of the communication session.
The method to detect transcoding from the initial description involves storing data related to the transcoding that occurred during the communication session for analysis.
13. The method of claim 8 , with the integrity information comprising predetermined information that is added or appended to the payload data of the origination communication.
In the method to detect transcoding from the initial description, the integrity information is generated by adding or appending predetermined data to the payload data of the media packets before sending them.
14. The method of claim 8 , with the integrity information comprising predetermined information that is modified into or subtracted from the payload data of the origination communication.
In the method to detect transcoding from the initial description, the integrity information is generated by modifying or subtracting predetermined data *from* the payload data of the media packets before sending them.
15. A method of operating a packet communication network to determine transcoding in packet communications, the method comprising: generating an origination communication in an IP origination point and transmitting the origination communication into a media transport path, with the origination communication including payload data and integrity information that is configured to be modified by one or more transcoding operations; the IP origination point comparing a returned integrity information to the integrity information, wherein the returned integrity information may have been modified by the one or more transcoding operations; the IP origination point determining a transcoding level of transcoding that occurred in the media transport path if the returned integrity information is not equal to the sent integrity information and generating a re-origination communication based on the determined transcoding level; and the IP origination point transmitting the re-origination communication into the media transport path.
A method for detecting media packet modifications ("transcoding") in a network. An IP endpoint sends media packets with payload data and an integrity check value. After network transmission, the endpoint compares the returned integrity value with the original. If different, transcoding is detected, and the "level" of transcoding is determined. A new packet is generated based on the determined transcoding level and then re-transmitted into the network.
16. The method of claim 15 , wherein multiple transcoding operations may be detected using the returned integrity information.
The method to detect transcoding from the previous description involves detecting *multiple* different transcoding operations that occurred during packet transmission by analyzing the modifications to the returned integrity information.
17. The method of claim 15 , with the transcoding level comprising a narrowest transcoding.
In the method to detect transcoding from the initial description, the determined transcoding level represents the most restrictive transcoding that occurred.
18. The method of claim 15 , further comprising: storing the transcoding level and transcoding data of the communication session; generating a transcode-ready data comprising the payload data modified according to the transcoding level; and generating the re-origination communication including the transcode-ready data, wherein the re-origination communication re-originates the communication session using the transcode-ready data.
The method to detect transcoding from the initial description involves storing the determined transcoding level and related transcoding data. Then, the original payload data is modified to be compatible with this transcoding level. A new packet ("re-origination communication") containing the modified data is generated, and the communication session is restarted using this packet.
19. The method of claim 15 , with the integrity information comprising predetermined information that is added or appended to the payload data of the origination communication.
In the method to detect transcoding from the initial description, the integrity information is generated by adding or appending predetermined data to the payload data of the media packets before sending them.
20. The method of claim 15 , with the integrity information comprising predetermined information that is modified into or subtracted from the payload data of the origination communication.
In the method to detect transcoding from the initial description, the integrity information is generated by modifying or subtracting predetermined data *from* the payload data of the media packets before sending them.
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August 19, 2013
March 28, 2017
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